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8.7

How compare the different between two pictures using matlab?

Asked by YANKAUSKAS in MatLab Programming Language, Math & Science, Signal Processing

Tags: matlab

I'm trying to find the similarity of 2 images by measuring the histogram error between them, the smaller, the better similar. The method I currently use is:
+ Calculate normalized histogram of both 2 images
+ Calculate the sum of the squared differences between the normalized histograms using the below attached formula.
My code in matlab like this (code below).

I have questions:
1. I think what I do is correct. Do you have any comments of potential problems?
2. I convert these above code to function: findsim(image1,image2). Now I want to write a small code using this function above. I have total 10 pictures, and now I want to get individual picture, compare to the remains 9 pictures using above function. And export the list of 9 pictures according to the error from minimum to maximum. I'm thinking using a for loop but, is there any other way less painful? How to get the list of all images, take only one each time and do the task I want with a short number of codes?
Any comment or suggestions are appreciate!

View the Solution FREE for 30 Days

         
             % read two images
Im1 = imread('image1.bmp');
Im2 = imread('image2.bmp');
 
%  convert images to type double (range from from 0 to 1 instead of from 0 to 255)
Im1 = im2double(Im1);
Im2 = im2double(Im2);
 
% Calculate the Normalized Histogram of Image 1 and Image 2
hn1 = imhist(Im1)./numel(Im1);
hn2 = imhist(Im2)./numel(Im2);
 
% Calculate the histogram error
f = sum((hn1 - hn2).^2);
f %display the result to console

20091118-EE-VQP-93 - Hierarchy / EE_QW_3_20080625

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How compare the different between two pictures using matlab?

Asked by YANKAUSKAS in MatLab Programming Language, Math & Science, Signal Processing

Tags: matlab

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